Hydraulic oil filtering device for hydraulic equipment

Abstract

The present invention relates to the technical field of hydraulic equipment, and specifically discloses a hydraulic oil filtering device for hydraulic equipment, comprising a shell and a filtering structure arranged in the shell, the shell being provided with an oil inlet pipe and an oil outlet pipe, the filtering structure comprising a filter cartridge and a protective sleeve for supporting and wrapping the outer wall of the filter cartridge, a plurality of filter plates being fixedly connected to the filter cartridge in a circumferential direction, a plurality of oil inlet through grooves for exposing the filter plates being opened in a circumferential direction of the protective sleeve, a plurality of slag collecting bars being vertically slidably connected to the filter cartridge in a circumferential direction, a connecting notch being opened at the bottom of the slag collecting bar which is close to the filter plate, a spring for lifting the slag collecting bar upwards being provided at the bottom of the filter cartridge, a plurality of pressing rods for pressing the slag collecting bar downwards being provided at the top of the shell, a slag collecting groove being opened at the bottom of the protective sleeve corresponding to the bottom of the slag collecting bar, and a notch being opened on the inner side of the slag collecting groove which can connect the inner cavity of the shell with the connecting notch, thereby solving the problem that the traditional hydraulic oil filtering device cannot autonomously peel off and collect the metal particles filtered out of the filter element and attached to the filter element during use.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic equipment, and specifically discloses a hydraulic oil filtering device for hydraulic equipment. Background Art

[0002] Hydraulic equipment, as the most common power component in industry, is a mechanical device that transfers energy through liquid pressure and relies on hydraulic oil to transfer kinetic energy. It is often used as a power component in mechanical equipment such as excavators, hydraulic presses, cranes, hydraulic cylinders, and hydraulic pumps.

[0003] Hydraulic oil circulates in the hydraulic system and is used in the hydraulic systems of large equipment such as hydraulic presses and excavators. Due to the wear between the chambers and the internal hydraulic rods in the hydraulic system, metal particles of different sizes will be generated. The metal particles will flow in the hydraulic system with the hydraulic oil. As the number of metal particles increases, the wear inside the hydraulic system will be aggravated during the flow process, shortening the service life of the hydraulic equipment. Therefore, most large hydraulic equipment is equipped with hydraulic oil filters.

[0004] The hydraulic oil filter is mainly composed of a shell and a filter element. The shell is connected with an oil inlet pipe and an oil outlet pipe. The hydraulic oil is introduced through the oil inlet pipe, filtered by the filter element and discharged from the oil outlet pipe. However, during long-term use, the metal particles filtered out by the filter element will increase, and the permeability of the filter element will gradually decrease, causing the hydraulic oil filter to be blocked, affecting the use of hydraulic equipment.

[0005] In the prior art, there is a method of installing a secondary filtering structure, that is, a secondary filter element. When the primary filter element is blocked and the internal pressure of the hydraulic oil filter increases to a certain level, the secondary filter element is opened to perform auxiliary filtering to eliminate the negative impact of the blockage of the primary filter element on the overall operation of the hydraulic equipment. However, in this type of hydraulic oil filter, the filtered metal particles are still blocked on the filter element, and the primary and secondary filter elements carried do not have a self-cleaning function, and the metal particles filtered and attached to the filter element cannot be peeled off and collected.

[0006] Therefore, in view of this, the inventor provides a hydraulic oil filtering device for hydraulic equipment to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to solve the problem that the traditional hydraulic oil filtering equipment cannot autonomously peel off and collect the metal particles filtered out from the filter element and attached to the filter element during use.

[0008] In order to achieve the above-mentioned purpose, the basic scheme of the present invention provides a hydraulic oil filtering device for hydraulic equipment, comprising a housing and a filtering structure arranged in the housing, the housing is provided with an oil inlet pipe and an oil outlet pipe connected with the filtering structure, the filtering structure comprises a filter cartridge and a protective sleeve fixed in the housing for supporting and wrapping the outer wall of the filter cartridge, a plurality of filter plates are fixedly connected to the filter cartridge circumferentially, a plurality of oil inlet grooves are opened circumferentially for the filter plates to be exposed, a plurality of slag collecting bars that can cover the filter plates are also circumferentially vertically slidably connected to the filter cartridge, a communicating notch is opened at the bottom of the slag collecting bar that is attached to one side of the filter plate, and a spring for lifting the slag collecting bar upward is also provided at the bottom of the filter cartridge;

[0009] A plurality of pressure rods for pressing down the slag collecting fence and control structures for controlling the pressing in of the pressure rods are also provided at the top of the shell. A slag collecting groove is opened at the bottom of the casing corresponding to the bottom of the slag collecting fence, and a notch is opened on the inner side of the slag collecting groove to connect the inner cavity of the shell with the connecting notch.

[0010] Furthermore, the control structure includes a accommodating box fixed to the inner wall of the shell and an airbag whose bottom is fixed in the accommodating box. The accommodating box has a through hole for the pressure rod to slide into. The pressure rod extends out of the top of the airbag and is fixed to a pressure plate bonded to the top of the airbag.

[0011] Furthermore, the filter cartridge is rotatably connected in the protective cartridge, and an oil drain pipe is fixedly connected to the top of the filter cartridge and is rotatably connected to and communicated with the oil outlet pipe. An arc guide groove is opened circumferentially on the oil drain pipe, and a driven mechanism is fixedly connected to the inner side of the pressure rod, which can be inserted into the arc guide groove and drive the oil drain pipe to rotate.

[0012] Furthermore, the driven mechanism includes a lever fixed to the inner side of the pressure rod and a lever head provided on the inner side of the lever and slidable in the arc guide groove. The depth of the arc guide groove gradually decreases along the rotation direction of the filter cartridge until it is flush with the outer wall of the oil drain pipe.

[0013] Furthermore, the bottom of the shell is rotatably connected to a counter which is driven by the filter cartridge to rotate synchronously.

[0014] Furthermore, the casing is provided with four oil inlet grooves in the circumferential direction, at least 12 filter plates are fixedly connected to the filter cartridge, and the pressure rod is arranged above the casing between adjacent oil inlet grooves.

[0015] Furthermore, a plurality of filter slots are provided between the two ends of the filter cartridge, the filter plates are respectively installed in the filter slots, and the height of the slag collecting fence is greater than the length of the filter slots.

[0016] Furthermore, a filter screen structure is fixedly connected to the inner side of the notch.

[0017] Furthermore, the filter screen structure is an elliptical protrusion fixedly connected to the inner side of the notch, a flow guide chamber communicating with the notch is formed in the elliptical protrusion, and a flow guide groove communicating with the flow guide chamber is formed at the bottom end of the elliptical protrusion.

[0018] The principle and effect of this scheme are:

[0019] 1. Compared with the prior art, the present invention filters the hydraulic oil circulating in the hydraulic equipment through the filter plate, and the filtered metal particles and impurities will fall into the slag collecting tank for collection, and some metal particles and impurities attached to the filter plate can be actively stripped off through the installed slag collecting bar and collected in the slag collecting tank, which solves the problem that the traditional hydraulic oil filtering equipment cannot autonomously strip off and collect the metal particles filtered out and attached to the filter element during use.

[0020] 2. Compared with the prior art, the slag collecting fence of the present invention realizes automatic downward sliding through the installed pressure rod and control structure. During the downward sliding process, the metal particles and impurities attached to the filter plate are stripped off through the bottom end of the slag collecting fence and the end of the filter plate.

[0021] 3. Compared with the prior art, the control structure of the present invention is composed of a containing box and an air bag. When the filter plate is not covered with metal particles and impurities, the hydraulic oil flowing inside the shell will not be blocked, the pressure remains constant, the air bag is in an open state, the pressure rod and the slag collecting bar are both at the top. As the use time increases, the filter plate will gradually be blocked by metal particles and impurities. At this time, the hydraulic oil flowing inside will be blocked, the pressure inside the shell will increase, and the contraction of the air bag will drive the pressure rod to slide down, pushing the slag collecting bar to slide down and peel off the attachments until it reaches the bottom of the slag collecting groove, and the notch connects the inner cavity of the shell and the connecting notch of the slag collecting bar, so that the hydraulic oil can penetrate the filter plate through the notch and the connecting notch, restore the pressure, open the air bag, lift the slag collecting bar, and unfold the filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of a hydraulic oil filter device for hydraulic equipment proposed in an embodiment of the present application is shown;

[0024] Figure 2 A schematic diagram showing the internal structure of a hydraulic oil filter device for hydraulic equipment proposed in an embodiment of the present application;

[0025] Figure 3 A schematic diagram showing a filtering structure of a hydraulic oil filtering device for hydraulic equipment proposed in an embodiment of the present application is shown;

[0026] Figure 4 A schematic diagram showing a control structure of a hydraulic oil filter device for hydraulic equipment proposed in an embodiment of the present application is shown;

[0027] Figure 5 A schematic diagram showing a control structure of a hydraulic oil filter device for hydraulic equipment proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0028] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0029] The figure marks in the drawings of the specification include: housing 1, oil inlet pipe 2, oil outlet pipe 3, counter 4, casing 5, filter cartridge 6, partition 7, slag collecting fence 8, filter plate 9, slag collecting trough 10, arc-shaped limit plate 11, oil drain pipe 12, accommodating box 13, pressure rod 14, lever 15, pressure plate 16, limit slider 17, air bag 18, arc-shaped guide groove 19, and guide groove 20.

[0030] A hydraulic oil filter device for hydraulic equipment, for example Figure 1 and Figure 2 As shown:

[0031] The invention comprises a shell 1 and a filtering structure installed in the shell 1 .

[0032] Two oil inlet pipes 2 and an oil outlet pipe 3 connected to the filtering structure are respectively installed on the top of the shell 1. The hydraulic oil to be filtered is introduced into the shell 1 through the oil inlet pipe 2, and the hydraulic oil is filtered by the filtering structure and then discharged through the oil outlet pipe 3.

[0033] The filtering structure includes a filter cartridge 6 and a protective cartridge 5 fixedly mounted in the housing 1 through a bracket. The filter cartridge 6 is mounted inside the protective cartridge 5, and the protective cartridge 5 wraps the filter cartridge 6. Twelve filter plates 9 are circumferentially mounted on the filter cartridge 6 to connect the inner and outer sides of the filter cartridge 6. The filter plates 9 perform filtering functions to isolate metal particles and other impurities in the hydraulic oil and attach them to the outside of the filter plates 9. Four oil inlet grooves are circumferentially opened on the protective cartridge 5 to expose one filter plate 9 respectively. In this embodiment, the angle between adjacent oil inlet grooves is 90 degrees.

[0034] Specifically, in this embodiment, 12 filter slots are respectively opened between the two ends of the filter cartridge 6, and a partition 7 is formed between the filter cartridges 6 between adjacent filter slots. The filter plates 9 are respectively installed in the filter slots, and the inner walls of the filter cartridges 6 on both sides of the filter slots are also provided with guide chutes. The filter cartridge 6 is also provided with 12 slag collecting bars 8 that slide in the filter slots and cover the filter plates 9. Specifically, the inner sides of the bottoms of the slag collecting bars 8 are provided with connecting notches, and the two sides of the slag collecting bars 8 are respectively fitted with the inner walls of the filter slots and are integrally formed with guide sliders that extend into the guide chutes on the same side, respectively. The guide sliders are located above the bottom of the slag collecting bars 8, and the inner ends of both ends of the slag collecting bars 8 are fitted with the outer walls of the filter plates 9.

[0035] In this embodiment, the guide slider extends outward to form a limit slider 17, and the filter tank at the bottom of the guide chute is also formed with a limit slide upward to block the limit slider 17 from sliding down. Located in the guide chute, a spring for lifting the slag collecting fence 8 upward is fixedly installed between the bottom of the guide slider and the bottom surface of the guide chute.

[0036] The inner wall of the casing 5 is provided with an annular groove for the limiting slider 17 to slide inside. The bottom of the casing 5 is also provided with 12 slag collecting grooves 10 corresponding to the bottom of the slag collecting fence 8. The inner side of the slag collecting groove 10 is provided with a notch connecting the inner cavity of the shell 1 and the connecting notch. When the slag collecting fence 8 slides to the bottom of the filter tank and extends into the slag collecting groove 10, the slag collecting fence 8 closes the filter plate 9, and the hydraulic oil in the inner chamber of the slag collecting fence 8 and the inner chamber of the shell 1 are connected through the notch, so that the hydraulic oil is introduced from the notch into the inner chamber of the slag collecting fence 8 and filtered through the filter plate 9.

[0037] A filter screen structure is also installed inside the notch, which is an elliptical protrusion fixed inside the notch, and a guide chamber connected to the notch is formed inside the elliptical protrusion, and a guide groove 20 connected to the guide chamber is opened at the bottom of the elliptical protrusion. During the downward movement of the slag collecting fence 8, the metal particles and other impurities attached to the filter plate 9 are scraped downward by the end of the bottom of the slag collecting fence 8 and the filter plate 9, and the hydraulic oil remaining in the filter tank is discharged from the guide groove 20 at the bottom of the elliptical protrusion through the notch, and the guide groove 20 opened at the bottom of the elliptical protrusion can effectively prevent metal particles and impurities from flowing back into the housing 1.

[0038] like Figure 3 As shown, the filter cartridge 6 is installed in the protective tube 5 and can rotate. An axial hole is opened at the bottom of the protective tube 5 and a rotating shaft is installed. The bottom of the filter cartridge 6 is fixedly installed on the rotating shaft. The rotating shaft passes through the outer shell 1 and a counter 4 is also installed at the outer end. The counter 4 installed in this embodiment is a counter 4 that counts with rotation and is commonly used in the prior art.

[0039] An oil drain pipe 12 connected to the internal chamber is welded to the top of the filter cartridge 6, and the oil outlet pipe 3 extends into the oil drain pipe 12 and can rotate relative to the oil drain pipe 12. A plurality of arc-shaped guide grooves 19 are opened in the circumferential direction of the outer wall of the oil drain pipe 12. Specifically, in this embodiment, the filter cartridge 6 and the oil drain pipe 12 rotate in a clockwise direction, and the height of the arc-shaped guide groove 19 gradually increases in the clockwise direction, and the depth of the arc-shaped guide groove 19 gradually decreases until it is flush with the outer wall of the oil drain pipe 12.

[0040] like Figure 3 , Figure 4 and Figure 5As shown, four pressure rods 14 for pressing down the slag collecting fence 8 and four control structures for controlling the pressing of the pressure rods 14 are installed at the top of the housing 1. The control structures include a container box 13 fixed to the inside of the housing 1 by a bracket and an air bag 18 installed in the container box 13. Specifically, two air bags 18 are installed in each container box 13, and the bottom of the air bag 18 is fixed to the bottom surface of the container box 13. A through hole for the pressure rod 14 to slide in is also opened at the bottom of the container box 13. After passing through the container box 13, the pressure rod 14 passes through the middle of the air bags 18 on both sides and is welded with a pressure plate 16 bonded to the top of the air bag 18. A baffle is also welded to the bottom of the pressure rod 14.

[0041] In this embodiment, the position where the filter plate 9 is exposed is called a filtering station. Between two adjacent filtering stations, there are two filter plates 9 located inside the casing 5, which are called the first waiting station and the second waiting station in clockwise direction.

[0042] The pressure rods 14 are respectively installed corresponding to the first waiting stations, and the pressure rods 14 are all located above the slag collecting fence 8 at the first waiting station. A follower mechanism is also installed on the inner side of the bottom of the pressure rods 14, and the follower mechanism includes a lever 15 welded on the inner side of the pressure rods 14 and a lever head welded on the inner end of the lever 15, and the lever head is placed in the vertical guide groove and can slide in the vertical guide groove and the arc guide groove 19.

[0043] Moreover, in this embodiment, an arc-shaped limit plate 11 is integrally formed on the inner side of the casing 5. The arc-shaped limit plate 11 is only arranged between the first waiting station and the next filtering station to prevent the slag collecting frame in the second waiting station from rising. The limit slider 17 can slide under the arc-shaped limit plate 11.

[0044] When the present invention is put into use for the first time in the hydraulic equipment, each filter plate 9 is not covered with impurities. At this time, after the hydraulic oil is introduced into the housing 1, the internal pressure of the housing 1 is kept constant, the airbag 18 is in an open state, and the pressure rod 14 is at the top. At this time, the slag collecting fence 8 of the filtering station and the first waiting station are also at the top. The slag collecting fence 8 in the second waiting station is placed on the inner side of the casing 5 due to the arc-shaped limit plate 11;

[0045] As the use time increases, the filter plate 9 in the oil inlet groove is gradually covered with metal particles or impurities, and some large metal particles will also fall into the slag collecting tank 10 below. When the hydraulic oil is supplied at a constant pressure, the internal pressure in the housing 1 increases due to the blockage of the filter plate 9. At this time, the airbag 18 gradually shrinks and the pressure rod 14 gradually falls.

[0046] As the use time continues to increase, the pressure rod 14 will continue to push the slag collecting fence 8 downward. In the first waiting position, the slag collecting fence 8 will slide down and scrape off the metal particles and impurities attached to the filter plate 9 through the bottom end, causing them to fall into the slag collecting groove 10, and the internal hydraulic oil will be discharged from the notch through the elliptical protrusion until the bottom end of the slag collecting fence 8 is pushed into the slag collecting groove 10. At this time, the dial head installed on the inner side of the pressure rod 14 is placed in the arc guide groove 19, and the inner cavity of the shell 1 and the connecting notch on the slag collecting fence 8 are connected through the notch. The hydraulic oil in the shell 1 enters the filter plate 9 through the notch and the connecting notch and reduces the internal pressure of the shell 1. The airbag 18 will expand and lift the pressure rod 14. During the lifting process of the pressure rod 14, the limit of the dial head and the arc guide groove 19 will drive the oil drain pipe 12 to rotate, thereby driving the filter cartridge 6 to rotate, and then driving the slag collecting fence 8 and the limit sliders 17 on both sides to rotate, and then during the rotation process, the limit slider 17 in the first waiting position is introduced into the arc limit plate 11. At this time, the slag collecting fence 8 in the second waiting station will enter the next filtering station, and the limiting slider 17 will be exposed from the arc-shaped limiting plate 11. The slag collecting fence 8 will be bounced up by the thrust of the spring below, exposing the cleaned filter plate 9, and the internal pressure of the shell 1 will be reduced. The pressure rod 14 will rise due to the thrust generated when the airbag 18 opens, so as to achieve a continuous filtering effect. In this embodiment, the counter 4 will also count once for each rotation. After a certain number of times, the shell 1 will be opened to uniformly clean the slag collecting tank 10 and the filter plate 9.

[0047] In the present invention, most of the cleaned metal particles and impurities will be stored in the slag collecting tank 10 in the first waiting station, and a small part will fall into the slag collecting tank 10 of the filtering station during the filtering process of the filter plate 9.

[0048] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A hydraulic oil filter for hydraulic equipment, characterized in that: The filter comprises a housing and a filtering structure arranged in the housing, the housing is provided with an oil inlet pipe and an oil outlet pipe connected with the filtering structure, the filtering structure comprises a filter cartridge and a protective sleeve fixed in the housing for supporting and wrapping the outer wall of the filter cartridge, a plurality of filter plates are fixedly connected to the filter cartridge circumferentially, a plurality of oil inlet slots are opened circumferentially for the filter plates to be exposed, a plurality of slag collecting bars that can cover the filter plates are also circumferentially vertically slidably connected to the filter cartridge, a communicating notch is opened at the bottom of the slag collecting bar that is attached to one side of the filter plate, and a spring for lifting the slag collecting bar upwards is also provided at the bottom of the filter cartridge; A plurality of pressure rods for pressing down the slag collecting fence and control structures for controlling the pressing in of the pressure rods are also provided at the top of the shell. A slag collecting groove is opened at the bottom of the casing corresponding to the bottom of the slag collecting fence, and a notch is opened on the inner side of the slag collecting groove to connect the inner cavity of the shell with the connecting notch.

2. The hydraulic oil filtering device for hydraulic equipment according to claim 1, characterized in that: The control structure includes a accommodating box fixedly connected to the inner wall of the shell and an airbag whose bottom is fixed in the accommodating box. The accommodating box has a through hole for a pressure rod to slide into. The pressure rod extends out of the top of the airbag and is fixedly connected to a pressure plate bonded to the top of the airbag.

3. The hydraulic oil filtering device for hydraulic equipment according to claim 1, characterized in that: The filter cartridge is rotatably connected in the casing, and an oil drain pipe rotatably connected and communicated with the oil outlet pipe is fixedly connected to the top of the filter cartridge. An arc guide groove is opened circumferentially on the oil drain pipe, and a driven mechanism that can be inserted into the arc guide groove and drive the oil drain pipe to rotate is fixedly connected to the inner side of the pressure rod.

4. The hydraulic oil filtering device for hydraulic equipment according to claim 3, characterized in that: The driven mechanism includes a lever fixed to the inner side of the pressure rod and a lever head arranged on the inner side of the lever and slidable in the arc guide groove. The depth of the arc guide groove gradually decreases along the rotation direction of the filter cartridge until it is flush with the outer wall of the oil drain pipe.

5. The hydraulic oil filtering device for hydraulic equipment according to claim 3, characterized in that: The bottom of the shell is rotatably connected with a counter which is driven by the filter cartridge to rotate synchronously.

6. The hydraulic oil filtering device for hydraulic equipment according to claim 3, characterized in that: The casing is provided with four oil inlet grooves in the circumferential direction, at least 12 filter plates are fixedly connected to the filter cartridge, and a pressure rod is arranged above the casing between adjacent oil inlet grooves.

7. The hydraulic oil filtering device for hydraulic equipment according to claim 6, characterized in that: A plurality of filter slots are provided between the two ends of the filter cartridge, and filter plates are respectively installed in the filter slots, and the height of the slag collecting fence is greater than the length of the filter slots.

8. The hydraulic oil filtering device for hydraulic equipment according to claim 1, characterized in that: A filter screen structure is fixedly connected to the inner side of the notch.

9. The hydraulic oil filtering device for hydraulic equipment according to claim 8, characterized in that: The filter screen structure is an elliptical protrusion fixedly connected to the inner side of the notch, a flow guide chamber connected to the notch is formed in the elliptical protrusion, and a flow guide groove connected to the flow guide chamber is formed at the bottom end of the elliptical protrusion.

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